Early Cenozoic Molybdenum Isotope and Geochemical Dataset from the Southwest Pacific (IODP Site U1509)
LIU Xiaowen1LI Yuchen1,2SUN Xiaole1,2SUN Weidong1,2,3HAO Yufei1,2WU Sifan1,2LI Le1,2HUANG Jing*1,2
1 Center of Deep Sea Research，Institute of Oceanology，Chinese Academy of Sciences，Qingdao 266071，China2 University of Chinese Academy of Sciences，Beijing 100049，China3 Ocean Sciences and Interdisciplinary Frontiers，Laoshan Laboratory，Qingdao 266237，China
DOI:10.3974/geodb.2025.10.08.V1
Published:Oct. 2025
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Key Words：
Molybdenum isotopes,ocean oxygenation,Early Cenozoic,Southern Ocean ventilation,continental weathering
Abstract：
The author conducted molybdenum (Mo) isotope and related geochemical analyses on Early Cenozoic sediment samples collected from IODP Site U1509 in the Southwest Pacific, obtained through an IODP sampling request on July 27, 2017. The samples correspond to the Early Cenozoic warm climate interval (~59.5–50.5 Ma) and were freeze-dried and agate-milled prior to major element, trace element, and isotope measurements. Major elements were determined using an Agilent 5100 ICP–OES, trace elements with an Agilent 7900 ICP–MS, Mo isotopes using a Thermo Fisher Neptune Plus MC–ICP–MS with external reproducibility better than 0.1‰ (2 S.D.), and silicate Nd isotopes using a Finnigan MAT 262 TIMS with procedural blanks below 40 pg. Element enrichment factors were calculated by normalizing to Al as the detrital indicator. The dataset includes the geographic coordinates of the sampling site and Mo isotope compositions, major and trace element concentrations (Fe2O3, MnO2, Ti, Zr, Sc), and Nd isotope data from the 269.51–547.51 m interval of IODP Hole U1509. Stored in .shp and .xlsx formats, the dataset consists of nine files totaling 13.5 KB (compressed to 11.2 KB) and provides key geochemical evidence for reconstructing Early Cenozoic marine redox evolution, oxygen-deficient zone contraction, and terrigenous input mechanisms.
Foundation Item：
Ministry of Science and Technology of P. R. China (2023YFF0807102); Department of Science & Technology of Shandong Province (tspd20230609); National Natural Science Foundation of China (42221005)；
Data Citation：
LIU Xiaowen, LI Yuchen, SUN Xiaole, SUN Weidong, HAO Yufei, WU Sifan, LI Le, HUANG Jing*. Early Cenozoic Molybdenum Isotope and Geochemical Dataset from the Southwest Pacific (IODP Site U1509)[J/DB/OL]. Digital Journal of Global Change Data Repository, 2025. https://doi.org/10.3974/geodb.2025.10.08.V1.
References：
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Data Product:
| ID |
Data Name |
Data Size |
Operation |
| 1 |
Mo_Geochem_IODP_U1509.rar |
11.24KB |
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